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Subject: Re: infinite iteration
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>Hey! Right now I managed to induce an infinite (?) iteration
>via texexec. Apparently I did it by reading in mpgraph.1 as an
>external figure and having inline metapost code at the same
time.
>The strange thing is that in other circumstances, metapost
won't be
>run at all in between. I have to start it by hand to update
mpgraph.1.

Right, mpgraph is reserved for internal use. 

You can create a document namespace by saying: 

  \protectbufferstrue 

this can go in your local cont-sys.tex file. Also, when

  \runMPgraphicstrue

you can add

  \recycleMPslotstrue

to limit the number of scratch mp files when using pdftex. 

>My current question is: How do I scale a graphic produced by
inline
>Metapost code? The (re)?useMPgraphics commands don't seem to
provide
>scale options, as far as I can tell from the code.

The \useMPgraphic as well as \reuseMPgraphic and
\uniqueMPgraphic commands are primarily meant for usage as
backgrounds. 

There is startMPgraphic ... stopMPgraphic and some low level
load and place stuff that does support scaling. Just browse
around supp-mps.tex. 

Another one is: 

\startMPrun
  beginfig(10) ;
   ....
  endfig;
\stopMPrun

now you can use 

\externalfigure[mprun.10][width=10cm] 

and alike.

Of course you can input existing stuff into the run.   

Hans